Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1623468 | Journal of Alloys and Compounds | 2009 | 4 Pages |
Abstract
Three ZrB2-SiC composites were prepared from polycarbosilane (PCS)-coated ZrB2 powders. Powders with or without additions of Si or Zr were densified by hot pressing at 1800 °C. Finally, the oxidation resistance of the composites was studied at 1500 °C in air. The phase composition and microstructure were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM) along with energy-dispersive spectroscopy (EDS). Results showed that Si addition, which reacted with free carbon coming from the pyrolyzed PCS to produce the SiC, improved the oxidation resistance of ZrB2-SiC composites with PCS as a precursor, whereas Zr addition, which reacted with the carbon to produce the ZrC, decreased it.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Wei-Ming Guo, Xiao-Jun Zhou, Guo-Jun Zhang, Yan-Mei Kan, Yao-Gang Li, Pei-Ling Wang,